CVE-2025-38509 (GCVE-0-2025-38509)

Vulnerability from cvelistv5 – Published: 2025-08-16 10:54 – Updated: 2025-08-16 10:54
VLAI?
Title
wifi: mac80211: reject VHT opmode for unsupported channel widths
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: reject VHT opmode for unsupported channel widths VHT operating mode notifications are not defined for channel widths below 20 MHz. In particular, 5 MHz and 10 MHz are not valid under the VHT specification and must be rejected. Without this check, malformed notifications using these widths may reach ieee80211_chan_width_to_rx_bw(), leading to a WARN_ON due to invalid input. This issue was reported by syzbot. Reject these unsupported widths early in sta_link_apply_parameters() when opmode_notif is used. The accepted set includes 20, 40, 80, 160, and 80+80 MHz, which are valid for VHT. While 320 MHz is not defined for VHT, it is allowed to avoid rejecting HE or EHT clients that may still send a VHT opmode notification.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 751e7489c1d74b94ffffbed619d8fd724eeff4ee , < 18eca59a04500b68a90e0c5c873f97c9d1ea2bfa (git)
Affected: 751e7489c1d74b94ffffbed619d8fd724eeff4ee , < 58fcb1b4287ce38850402bb2bb16d09bf77b91d9 (git)
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    Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: reject VHT opmode for unsupported channel widths\n\nVHT operating mode notifications are not defined for channel widths\nbelow 20 MHz. In particular, 5 MHz and 10 MHz are not valid under the\nVHT specification and must be rejected.\n\nWithout this check, malformed notifications using these widths may\nreach ieee80211_chan_width_to_rx_bw(), leading to a WARN_ON due to\ninvalid input. This issue was reported by syzbot.\n\nReject these unsupported widths early in sta_link_apply_parameters()\nwhen opmode_notif is used. The accepted set includes 20, 40, 80, 160,\nand 80+80 MHz, which are valid for VHT. While 320 MHz is not defined\nfor VHT, it is allowed to avoid rejecting HE or EHT clients that may\nstill send a VHT opmode notification."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-16T10:54:46.493Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/18eca59a04500b68a90e0c5c873f97c9d1ea2bfa"
        },
        {
          "url": "https://git.kernel.org/stable/c/58fcb1b4287ce38850402bb2bb16d09bf77b91d9"
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      ],
      "title": "wifi: mac80211: reject VHT opmode for unsupported channel widths",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38509",
    "datePublished": "2025-08-16T10:54:46.493Z",
    "dateReserved": "2025-04-16T04:51:24.022Z",
    "dateUpdated": "2025-08-16T10:54:46.493Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.